BOSCH REXROTH
VT-MSPA2-1-1X/V0/0
R901010980
Valve Amplifiers
Prop. valve ampl, modul 1X
BOSCH REXROTH
MATERIAL: R901010980
SUMMARY: Prop. valve ampl, modul 1X
Quantity in stock: 0
You can either choose a single ramp (1 ramp time) or a 4-quadrant ramp (4 ramp times).
Characteristic curve generator [5]
Using the adjustable characteristic curve generator, step level and maximum values for positive and negative signals can be set separately, adjusted to the hydraulic requirements. The actual development of the characteristic curve through the zero point is not stepped but linear.
Amplitude limiter [6]
The internal command value is limited to approx. ±110 % of the nominal range.
Current controller [7]
The solenoid current is recorded, in the current controller compared with the control output and the difference is compensated.
Current output stage [8]
The current output stage creates the clocked solenoid current for the proportional valve. The solenoid current is limited to 2.7 A per output. The output stage outputs are short-circuit-proof. The output stages are de-energized in case of an internal fault signal or if the enable signal is missing.
Clock generator [9]
The clock generator creates the clock frequency "f" of the output stages. With pre-parameterized Rexroth valves, the frequency changes dependent on the command value and on the operating voltage.
Fault recognition [11]
The solenoid conductor is monitored for cable break as well as over-current of the output stage.
General
The amplifier modules are snapped onto top hat rails. The electrical connection is established via screw terminals. The modules are operated with 24 V direct voltage.
Power supply unit [1]
The amplifier modules have a power supply unit with making current limiter. This unit supplies all internally required positive and negative supply voltages. The making current limiter prevents high making current peaks.
Command value presetting
The internal command value signal is calculated from the total [3] of the external command value signal available at the differential input [2] and the zero point offset (zero point potentiometer "Zw").
A positive command value results in a current increase in solenoid “b” and thus a flow in the valve from P to A and from B to T.
A negative command value results in a current increase in solenoid “a” and thus a flow in the valve from P to B and from A to T.
Enable function [10]
Using the enable function, the power output stages are enabled and the internal command value signal is forwarded to the ramp generator. The enable signal is indicated by an LED on the front plate. If enable is connected, the internal command value is changed (with any kind of command value presetting) by the set ramp time. Thus, a controlled valve does not open abruptly.
Ramp generator [4]
The ramp generator limits the incline of the control output. The downstream step functions and amplitude attenuators do not extend or shorten the ramp time.
Notices for setting and measurement of the ramp time:
|
Value at measuring socket |
U/V |
5 |
3 |
2 |
1 |
0.5 |
0.3 |
0.2 |
0.1 |
0.05 |
0.03 |
0.02 |
|
Current ramp time (±20 %) |
t/ms |
20 |
33 |
50 |
100 |
200 |
333 |
500 |
1000 |
2000 |
3333 |
5000 |
|
01 |
02 |
03 |
04 |
05 |
||||
|
VT-MSPA |
‒ |
2X |
/ |
00 |
/ |
* |
|
01 |
Valve amplifier for proportional valves without electrical position feedback, Analog, Modular design |
VT-MSPA |
|
02 |
1 solenoid |
1 |
|
2 solenoids |
2 |
|
|
03 |
Component series 20 ... 29 (20 ... 29: unchanged installation and connection dimensions) - Size 6 |
2X |
|
04 |
Command value, voltage |
A1 |
|
Command value, current |
F2 |
|
|
05 |
Further details in the plain text |
* |
General
|
Component series |
1X | |
|
Type of electronics |
Analog | |
|
Design |
Modul |
Voltage supply
|
Operating voltage |
nominal |
U |
V |
24 |
|
Lower limit value |
UB(t)min |
V |
18 | |
|
Upper limit value |
UB(t)max |
V |
35 | |
|
Power consumption |
max. |
Smax |
VA |
48 |
|
Current consumption |
max. |
Imax |
A |
2 |
|
Fuse |
Thermal overload protection (with restart if the value falls below the temperature threshold) | |||
Analog inputs
|
Command value |
Voltage (differential input) |
U |
V |
0 ... ±10 | |
|
Voltage (differential input) |
Input resistance |
R |
kΩ |
≥ 50 | |
Digital inputs
|
Enable 1) |
On (active) |
U |
V |
8.5 ... UB |
|
Enable |
Off (inactive) |
U |
V |
0 ... 6.5 |
| 1) | RE > 100 kΩ |
Solenoid outputs
|
Solenoid current |
max. |
Imax |
A |
2.5 | |
|
Clock frequency 1) |
command value-dependent |
WRA6-2X |
f |
Hz |
350 ... 240 |
|
Clock frequency 2) |
command value-dependent |
WRA10-2X |
f |
Hz |
380 ... 180 |
|
Clock frequency 3) |
Setting range |
f |
Hz |
150 ... 400 | |
|
Solenoid output |
other properties |
Short-circuit-proof, clocked | |||
|
Cable length |
for 1.5 mm2 |
L |
m |
50 | |
| 1) | With Ucommand = 0 V: 350 Hz |
| 2) | With Ucommand = 0 V: 380 Hz |
| 3) | Pre-set for valve 4WRPH6...-2X...-855 |
Adjustment options
|
Zero point calibration |
% |
± 30 | ||
|
Amplitude attenuator 1) |
for command value |
% |
0 ... 110 | |
|
Ramp time up/down |
t |
s |
0.02 … 5 | |
|
Step-change height |
% |
0 ... 50 | ||
| 1) | Applies to a step level setting of 0% |
Measuring sockets
|
Command value |
"w" |
U |
V |
0 ... ±10 | |
|
after ramp |
"wR" |
U |
V |
0 ... ±10 | |
|
Actual current value |
"I" |
U |
V |
0 ... ±2.5 (mV ≙ mA) | |
|
Ramp time |
“down" |
t |
s |
0.02 ... 5 | |
|
“up" |
t |
s |
0.02 ... 5 | ||
|
additional notices |
See Function | ||||
Displays
|
LED display |
Green |
Ready for operation | |
|
yellow |
Enable |
Supplementary information
|
Anschlussart |
12 screw terminals | ||
|
Mounting type |
Top hat rail TH 35-7.5 according to EN 60715 | ||
|
Type of protection according to EN 60529 |
IP 20 | ||
|
Ambient temperature range |
ϑ |
°C |
0 … 50 |
|
Storage temperature range |
ϑ |
°C |
-25 … 70 |
|
Weight |
m |
kg |
0.14 |
For applications outside these parameters, please consult us!
|
1 |
General application with Imax = 2.5 A; f = 150 Hz … 400 Hz |
|
2 |
Clock frequency optimized for WRA 10 |
|
3 |
Clock frequency optimized for WRA 6 |
|
Gw+ |
Amplitude attenuator for positive command values |
|
Gw- |
Amplitude attenuator for negative command values |
|
Sw+ |
Step level for positive direction |
|
Sw- |
Step level for negative direction |
|
Zw |
Zero point command value |
|
t < |
Ramp time "Ramp up" |
|
t > |
Ramp time "Ramp down" |
|
f |
Clock frequency |
Measuring sockets
|
t < |
Ramp time "Ramp up" |
|
t > |
Ramp time "Ramp down" |
|
I |
Actual current value (mV ≙ mA) |
|
w |
Command value |
|
wR |
Command value after ramp |
|
⊥ |
Reference potential |
LED displays
|
|
Ready for operation (green) |
|
|
Enable (yellow) |
|
Power supply unit |
|
|
Differential amplifier |
|
|
Command value summation |
|
|
Ramp generator |
|
|
Characteristic curve generator |
|
|
Amplitude limiter |
|
|
Current controller |
|
|
Power output stage |
|
|
Clock generator |
|
|
Enable |
|
|
Fault recognition |
|
|
Inverter |
|
|
Zero point command value |
|
|
Ramp time "Ramp up" |
|
|
Ramp time "Ramp down" |
|
|
Step-change height |
|
|
Amplitude attenuator |
|
|
Command value |
|
|
Command value after ramp |
|
|
|
Ready for operation (green) |
|
|
Enable (yellow) |
Rectifier sandwich plate
Dimensions in mm
Dimensions in mm
The amplifier module may only be wired when de-energized.
Do not lay lines close to power cables.
Do not use free-wheeling diodes in the solenoid conductors.
The distance to aerial lines, radios, and radar systems has to be at least 1 m.
Always shield command value lines; connect shielding to protective earth (PE) on the module side.
Recommendation:
Also shield the solenoid conductors. For solenoid conductors up to a length of 50 m, use cable type LiYCY 1.5 mm2. For greater lengths, please contact us.
For switching command values, relays with gold-plated contacts have to be used (low voltages, low currents).
Only carry out measurements at the module using instruments with Ri > 100 kΩ.
For setting the potentiometers, use a screwdriver with a blade width of 4 mm.
With a strongly fluctuating operating voltage, it may in individual cases be necessary to use an external smoothing capacitor with a capacity of at least 2200 µF.
Recommendation: VT 11110 capacitor module (see data sheet 30750); sufficient for up to 3 amplifier modules
In the condition as supplied, the setting of the clock frequency corresponds to the requirements of the WRA 6 and
WRA 10 valves. Rotating the potentiometer “f” changes the valve hysteresis and may lead to disturbing noise developments.
Setting information
Preconditions: The system-specific circuitry must have been completed.
Zero point command value
Set the external command value presetting to zero
Set the internal command value to zero using the zero point potentiometer “Zw” and check the setting at measuring socket “wR”
Ramp times
Set ramp time according to formula or table (see functional description “Ramp generator”) and check it at the measuring sockets “t >” and “t <”.
Step level
Apply the enable signal
Use the zero point potentiometer "Zw” to set the measurement signal at "wR" to +0.3 V
Use potentiometer “Sw+” to set the required positive step level
Use the zero point potentiometer “Zw” to set the measurement signal at “wR” to –0.3 V
Use potentiometer “Sw-” to set the required negative step level
Set the zero point
Notice:
With external command value presetting, it must be at least +0.3 V / –0.3 V at measuring socket “wR”.
Maximum values
Notice:
Before adjusting the maximum values, zero point and step levels have to be set correctly.
The maximum current must not exceed the rated current of the solenoids.
Generate a command value ±100 % externally
Use potentiometer “Gw+/Gw-” to set the required maximum control output and check at measuring sockets “wR” and “w”
Clock frequency
Condition as supplied:
S = 1: f = 170 Hz
S = 2 and “w” = 0: f = 380 Hz
S = 3 and “w” = 0: f = 350 Hz
The frequency can be reset using a digital multimeter which can measure frequencies. Measure at connection terminals 7 or 9 against 2 (ground).